Cavity wall insulation guides & prices
Every SEAI grant guide, cost breakdown, suitability check, technical standard and county reference in one place.
Free, no obligation. One SEAI-registered contractor prices it, not five.
- €1,300SEAI grant, semi-D
- €285left to pay on a semi-D after the grant
- 1 dayto fill the walls of most houses
Read the guides
- Cavity wall insulation grantSEAI amounts by home type, higher welfare/HAP rates and the rules.
- Cavity wall insulation costSEAI median costs before and after the grant, plus per-m² guide.
- SEAI grant amounts 2026Every wall insulation grant in one reference table.
- Compare wall grantsCavity, internal dry lining and external wrap compared side by side.
- Second wall insulation grantHow a home that had a cavity grant can still claim internal or external.
- Is my house suitable?How to check for a pumpable cavity, solid wall, hollow block or timber frame.
- Pumped insulation, step by stepBorescope survey, 40 mm rule, sleeved vents and the NSAI declaration.
- Bonded bead insulationPolystyrene bead and PVA binder explained.
- Bonded bead problemsSettled fill, bead leaks, blocked vents and how to fix them.
- Cavity wall insulation and dampDriving rain vs condensation, and what to check before filling.
- Cavity wall insulation removalWhen extraction is the right call and how it works.
- Is cavity wall insulation worth it?Yearly heating savings and payback by home type.
- Cavity wall insulation problemsDisadvantages, cold spots and the checks that prevent them.
- Hollow block wall insulationWhy 9-inch hollow block can't be pumped and the two alternatives.
- Cavity wall insulation FAQDirect answers on grants, costs, surveys, damp and eligibility.
- Technical & grant glossary (A–Z)Plain-English definitions of NSAI, DTSS, BER, MPRN and U-values.
- All 26 counties coveredCounty-by-county BER wall data, empty cavity shares and heating fuels.
Your cavity wall grant in 3 taps
Tap your home type, when it was built and any earlier wall grant. Your SEAI grant shows as you go. Then leave your number and one SEAI-registered contractor who covers your area rings you with a price.
Related 2026 Ireland Specialist Cost & Technical Guides
Cross-referenced Irish pricing benchmarks, SEAI/Revenue grant rules, and county specifications from partner reference hubs:
- Cavity Wall Insulation Grants (cavitywallinsulationgrants.ie) — 2026 Ireland Cost & Spec Guides: The SEAI cavity wall insulation grant in Ireland, explained as a grant: the fixed amount by house type (detached EUR 1,800, semi-detached or end of te
- Wall Insulation Grants (wallinsulationgrants.ie) — 2026 Ireland Cost & Spec Guides: The three SEAI wall insulation grants side by side for Irish homes: cavity (EUR 700-1,800, higher rate up to EUR 2,300 for certain welfare recipients
- External Insulation Grant (externalinsulationgrant.ie) — 2026 Ireland Cost & Spec Guides: The SEAI external wall insulation grant (EUR 8,000 detached, 6,000 semi-D or end of terrace, 3,500 mid-terrace, 3,000 apartment) against the visitor's
- Midland Insulation (midlandinsulation.ie) — 2026 Ireland Cost & Spec Guides: Home insulation and SEAI insulation grants across the Irish Midlands (Laois, Offaly, Westmeath, Longford, Roscommon, Kildare, Tipperary and Meath) and
- Window Grants (windowgrants.ie) — 2026 Ireland Cost & Spec Guides: Guide to the SEAI windows and doors grant in Ireland (opened 2 March 2026): amounts by house type, eligibility including the BER Heat Loss Indicator,
Cavity wall insulation guides & price breakdowns
Straight answers to what people ask most: itemised costs, specifications, planning or grants, and what to check before you book.
More guides & resources: Cavity wall insulation and damp · Cavity wall insulation removal · Cavity wall insulation problems · All guides & calculator hub · Technical & trade glossary · Frequently asked questions · About this site
Cavity wall insulation across all 26 counties
Requests from all 26 counties go to one vetted local specialist who covers your county — from Dublin, Cork, Galway and Limerick to Kildare, Meath, Wicklow, Waterford and Donegal. Pick your county below for local prices, specifications and advice.